2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/mempool.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/bio.h>
19 #include <linux/list_sort.h>
32 #include "trace_gfs2.h"
35 * gfs2_pin - Pin a buffer in memory
36 * @sdp: The superblock
37 * @bh: The buffer to be pinned
39 * The log lock must be held when calling this function
41 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
43 struct gfs2_bufdata *bd;
45 BUG_ON(!current->journal_info);
47 clear_buffer_dirty(bh);
48 if (test_set_buffer_pinned(bh))
49 gfs2_assert_withdraw(sdp, 0);
50 if (!buffer_uptodate(bh))
51 gfs2_io_error_bh(sdp, bh);
53 /* If this buffer is in the AIL and it has already been written
54 * to in-place disk block, remove it from the AIL.
56 spin_lock(&sdp->sd_ail_lock);
58 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
59 spin_unlock(&sdp->sd_ail_lock);
61 atomic_inc(&sdp->sd_log_pinned);
62 trace_gfs2_pin(bd, 1);
65 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
67 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
70 static void maybe_release_space(struct gfs2_bufdata *bd)
72 struct gfs2_glock *gl = bd->bd_gl;
73 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
74 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
75 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
76 struct gfs2_bitmap *bi = rgd->rd_bits + index;
78 if (bi->bi_clone == NULL)
80 if (sdp->sd_args.ar_discard)
81 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
82 memcpy(bi->bi_clone + bi->bi_offset,
83 bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
84 clear_bit(GBF_FULL, &bi->bi_flags);
85 rgd->rd_free_clone = rgd->rd_free;
86 rgd->rd_extfail_pt = rgd->rd_free;
90 * gfs2_unpin - Unpin a buffer
91 * @sdp: the filesystem the buffer belongs to
92 * @bh: The buffer to unpin
94 * @flags: The inode dirty flags
98 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
99 struct gfs2_trans *tr)
101 struct gfs2_bufdata *bd = bh->b_private;
103 BUG_ON(!buffer_uptodate(bh));
104 BUG_ON(!buffer_pinned(bh));
107 mark_buffer_dirty(bh);
108 clear_buffer_pinned(bh);
110 if (buffer_is_rgrp(bd))
111 maybe_release_space(bd);
113 spin_lock(&sdp->sd_ail_lock);
115 list_del(&bd->bd_ail_st_list);
118 struct gfs2_glock *gl = bd->bd_gl;
119 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
120 atomic_inc(&gl->gl_ail_count);
123 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
124 spin_unlock(&sdp->sd_ail_lock);
126 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
127 trace_gfs2_pin(bd, 0);
129 atomic_dec(&sdp->sd_log_pinned);
132 static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
134 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
135 (sdp->sd_log_flush_head != sdp->sd_log_head));
137 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
138 sdp->sd_log_flush_head = 0;
141 static u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
143 unsigned int lbn = sdp->sd_log_flush_head;
144 struct gfs2_journal_extent *je;
147 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
148 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
149 block = je->dblock + lbn - je->lblock;
150 gfs2_log_incr_head(sdp);
159 * gfs2_end_log_write_bh - end log write of pagecache data with buffers
160 * @sdp: The superblock
162 * @error: The i/o status
164 * This finds the relavent buffers and unlocks then and sets the
165 * error flag according to the status of the i/o request. This is
166 * used when the log is writing data which has an in-place version
167 * that is pinned in the pagecache.
170 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
173 struct buffer_head *bh, *next;
174 struct page *page = bvec->bv_page;
177 bh = page_buffers(page);
179 while (bh_offset(bh) < bvec->bv_offset)
180 bh = bh->b_this_page;
183 set_buffer_write_io_error(bh);
185 next = bh->b_this_page;
193 * gfs2_end_log_write - end of i/o to the log
195 * @error: Status of i/o request
197 * Each bio_vec contains either data from the pagecache or data
198 * relating to the log itself. Here we iterate over the bio_vec
199 * array, processing both kinds of data.
203 static void gfs2_end_log_write(struct bio *bio)
205 struct gfs2_sbd *sdp = bio->bi_private;
206 struct bio_vec *bvec;
211 fs_err(sdp, "Error %d writing to log\n", bio->bi_status);
213 bio_for_each_segment_all(bvec, bio, i) {
214 page = bvec->bv_page;
215 if (page_has_buffers(page))
216 gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
218 mempool_free(page, gfs2_page_pool);
222 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
223 wake_up(&sdp->sd_log_flush_wait);
227 * gfs2_log_flush_bio - Submit any pending log bio
228 * @sdp: The superblock
230 * @op_flags: req_flag_bits
232 * Submit any pending part-built or full bio to the block device. If
233 * there is no pending bio, then this is a no-op.
236 void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
238 if (sdp->sd_log_bio) {
239 atomic_inc(&sdp->sd_log_in_flight);
240 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
241 submit_bio(sdp->sd_log_bio);
242 sdp->sd_log_bio = NULL;
247 * gfs2_log_alloc_bio - Allocate a new bio for log writing
248 * @sdp: The superblock
249 * @blkno: The next device block number we want to write to
251 * This should never be called when there is a cached bio in the
252 * super block. When it returns, there will be a cached bio in the
253 * super block which will have as many bio_vecs as the device is
256 * Returns: Newly allocated bio
259 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
261 struct super_block *sb = sdp->sd_vfs;
264 BUG_ON(sdp->sd_log_bio);
266 bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
267 bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
268 bio->bi_bdev = sb->s_bdev;
269 bio->bi_end_io = gfs2_end_log_write;
270 bio->bi_private = sdp;
272 sdp->sd_log_bio = bio;
278 * gfs2_log_get_bio - Get cached log bio, or allocate a new one
279 * @sdp: The superblock
280 * @blkno: The device block number we want to write to
282 * If there is a cached bio, then if the next block number is sequential
283 * with the previous one, return it, otherwise flush the bio to the
284 * device. If there is not a cached bio, or we just flushed it, then
285 * allocate a new one.
287 * Returns: The bio to use for log writes
290 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
292 struct bio *bio = sdp->sd_log_bio;
296 nblk = bio_end_sector(bio);
297 nblk >>= sdp->sd_fsb2bb_shift;
300 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
303 return gfs2_log_alloc_bio(sdp, blkno);
308 * gfs2_log_write - write to log
309 * @sdp: the filesystem
310 * @page: the page to write
311 * @size: the size of the data to write
312 * @offset: the offset within the page
314 * Try and add the page segment to the current bio. If that fails,
315 * submit the current bio to the device and create a new one, and
316 * then add the page segment to that.
319 static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
320 unsigned size, unsigned offset)
322 u64 blkno = gfs2_log_bmap(sdp);
326 bio = gfs2_log_get_bio(sdp, blkno);
327 ret = bio_add_page(bio, page, size, offset);
329 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
330 bio = gfs2_log_alloc_bio(sdp, blkno);
331 ret = bio_add_page(bio, page, size, offset);
337 * gfs2_log_write_bh - write a buffer's content to the log
338 * @sdp: The super block
339 * @bh: The buffer pointing to the in-place location
341 * This writes the content of the buffer to the next available location
342 * in the log. The buffer will be unlocked once the i/o to the log has
346 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
348 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh));
352 * gfs2_log_write_page - write one block stored in a page, into the log
353 * @sdp: The superblock
354 * @page: The struct page
356 * This writes the first block-sized part of the page into the log. Note
357 * that the page must have been allocated from the gfs2_page_pool mempool
358 * and that after this has been called, ownership has been transferred and
359 * the page may be freed at any time.
362 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
364 struct super_block *sb = sdp->sd_vfs;
365 gfs2_log_write(sdp, page, sb->s_blocksize, 0);
368 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
369 u32 ld_length, u32 ld_data1)
371 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
372 struct gfs2_log_descriptor *ld = page_address(page);
374 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
375 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
376 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
377 ld->ld_type = cpu_to_be32(ld_type);
378 ld->ld_length = cpu_to_be32(ld_length);
379 ld->ld_data1 = cpu_to_be32(ld_data1);
384 static void gfs2_check_magic(struct buffer_head *bh)
389 clear_buffer_escaped(bh);
390 kaddr = kmap_atomic(bh->b_page);
391 ptr = kaddr + bh_offset(bh);
392 if (*ptr == cpu_to_be32(GFS2_MAGIC))
393 set_buffer_escaped(bh);
394 kunmap_atomic(kaddr);
397 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
399 struct gfs2_bufdata *bda, *bdb;
401 bda = list_entry(a, struct gfs2_bufdata, bd_list);
402 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
404 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
406 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
411 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
412 unsigned int total, struct list_head *blist,
415 struct gfs2_log_descriptor *ld;
416 struct gfs2_bufdata *bd1 = NULL, *bd2;
423 list_sort(NULL, blist, blocknr_cmp);
424 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
429 gfs2_log_unlock(sdp);
430 page = gfs2_get_log_desc(sdp,
431 is_databuf ? GFS2_LOG_DESC_JDATA :
432 GFS2_LOG_DESC_METADATA, num + 1, num);
433 ld = page_address(page);
435 ptr = (__be64 *)(ld + 1);
438 list_for_each_entry_continue(bd1, blist, bd_list) {
439 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
441 gfs2_check_magic(bd1->bd_bh);
442 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
448 gfs2_log_unlock(sdp);
449 gfs2_log_write_page(sdp, page);
453 list_for_each_entry_continue(bd2, blist, bd_list) {
455 gfs2_log_unlock(sdp);
456 lock_buffer(bd2->bd_bh);
458 if (buffer_escaped(bd2->bd_bh)) {
460 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
461 ptr = page_address(page);
462 kaddr = kmap_atomic(bd2->bd_bh->b_page);
463 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
465 kunmap_atomic(kaddr);
467 clear_buffer_escaped(bd2->bd_bh);
468 unlock_buffer(bd2->bd_bh);
470 gfs2_log_write_page(sdp, page);
472 gfs2_log_write_bh(sdp, bd2->bd_bh);
482 gfs2_log_unlock(sdp);
485 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
487 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
491 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
492 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
495 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
497 struct list_head *head;
498 struct gfs2_bufdata *bd;
504 while (!list_empty(head)) {
505 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
506 list_del_init(&bd->bd_list);
507 gfs2_unpin(sdp, bd->bd_bh, tr);
511 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
512 struct gfs2_log_header_host *head, int pass)
517 jd->jd_found_blocks = 0;
518 jd->jd_replayed_blocks = 0;
521 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
522 struct gfs2_log_descriptor *ld, __be64 *ptr,
525 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
526 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
527 struct gfs2_glock *gl = ip->i_gl;
528 unsigned int blks = be32_to_cpu(ld->ld_data1);
529 struct buffer_head *bh_log, *bh_ip;
533 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
536 gfs2_replay_incr_blk(jd, &start);
538 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
539 blkno = be64_to_cpu(*ptr++);
541 jd->jd_found_blocks++;
543 if (gfs2_revoke_check(jd, blkno, start))
546 error = gfs2_replay_read_block(jd, start, &bh_log);
550 bh_ip = gfs2_meta_new(gl, blkno);
551 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
553 if (gfs2_meta_check(sdp, bh_ip))
556 mark_buffer_dirty(bh_ip);
564 jd->jd_replayed_blocks++;
571 * gfs2_meta_sync - Sync all buffers associated with a glock
576 static void gfs2_meta_sync(struct gfs2_glock *gl)
578 struct address_space *mapping = gfs2_glock2aspace(gl);
579 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
583 mapping = &sdp->sd_aspace;
585 filemap_fdatawrite(mapping);
586 error = filemap_fdatawait(mapping);
589 gfs2_io_error(gl->gl_name.ln_sbd);
592 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
594 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
595 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
598 gfs2_meta_sync(ip->i_gl);
604 gfs2_meta_sync(ip->i_gl);
606 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
607 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
610 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
612 struct gfs2_meta_header *mh;
614 struct list_head *head = &sdp->sd_log_le_revoke;
615 struct gfs2_bufdata *bd;
619 gfs2_write_revokes(sdp);
620 if (!sdp->sd_log_num_revoke)
623 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
624 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
625 offset = sizeof(struct gfs2_log_descriptor);
627 list_for_each_entry(bd, head, bd_list) {
628 sdp->sd_log_num_revoke--;
630 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
632 gfs2_log_write_page(sdp, page);
633 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
634 mh = page_address(page);
636 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
637 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
638 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
639 offset = sizeof(struct gfs2_meta_header);
642 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
643 offset += sizeof(u64);
645 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
647 gfs2_log_write_page(sdp, page);
650 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
652 struct list_head *head = &sdp->sd_log_le_revoke;
653 struct gfs2_bufdata *bd;
654 struct gfs2_glock *gl;
656 while (!list_empty(head)) {
657 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
658 list_del_init(&bd->bd_list);
660 atomic_dec(&gl->gl_revokes);
661 clear_bit(GLF_LFLUSH, &gl->gl_flags);
662 kmem_cache_free(gfs2_bufdata_cachep, bd);
666 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
667 struct gfs2_log_header_host *head, int pass)
672 jd->jd_found_revokes = 0;
673 jd->jd_replay_tail = head->lh_tail;
676 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
677 struct gfs2_log_descriptor *ld, __be64 *ptr,
680 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
681 unsigned int blks = be32_to_cpu(ld->ld_length);
682 unsigned int revokes = be32_to_cpu(ld->ld_data1);
683 struct buffer_head *bh;
689 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
692 offset = sizeof(struct gfs2_log_descriptor);
694 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
695 error = gfs2_replay_read_block(jd, start, &bh);
700 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
702 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
703 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
705 error = gfs2_revoke_add(jd, blkno, start);
711 jd->jd_found_revokes++;
715 offset += sizeof(u64);
719 offset = sizeof(struct gfs2_meta_header);
726 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
728 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
731 gfs2_revoke_clean(jd);
737 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
738 jd->jd_jid, jd->jd_found_revokes);
740 gfs2_revoke_clean(jd);
744 * databuf_lo_before_commit - Scan the data buffers, writing as we go
748 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
750 unsigned int limit = databuf_limit(sdp);
754 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
755 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
758 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
759 struct gfs2_log_descriptor *ld,
760 __be64 *ptr, int pass)
762 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
763 struct gfs2_glock *gl = ip->i_gl;
764 unsigned int blks = be32_to_cpu(ld->ld_data1);
765 struct buffer_head *bh_log, *bh_ip;
770 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
773 gfs2_replay_incr_blk(jd, &start);
774 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
775 blkno = be64_to_cpu(*ptr++);
776 esc = be64_to_cpu(*ptr++);
778 jd->jd_found_blocks++;
780 if (gfs2_revoke_check(jd, blkno, start))
783 error = gfs2_replay_read_block(jd, start, &bh_log);
787 bh_ip = gfs2_meta_new(gl, blkno);
788 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
792 __be32 *eptr = (__be32 *)bh_ip->b_data;
793 *eptr = cpu_to_be32(GFS2_MAGIC);
795 mark_buffer_dirty(bh_ip);
800 jd->jd_replayed_blocks++;
806 /* FIXME: sort out accounting for log blocks etc. */
808 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
810 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
811 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
814 gfs2_meta_sync(ip->i_gl);
821 gfs2_meta_sync(ip->i_gl);
823 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
824 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
827 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
829 struct list_head *head;
830 struct gfs2_bufdata *bd;
835 head = &tr->tr_databuf;
836 while (!list_empty(head)) {
837 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
838 list_del_init(&bd->bd_list);
839 gfs2_unpin(sdp, bd->bd_bh, tr);
844 const struct gfs2_log_operations gfs2_buf_lops = {
845 .lo_before_commit = buf_lo_before_commit,
846 .lo_after_commit = buf_lo_after_commit,
847 .lo_before_scan = buf_lo_before_scan,
848 .lo_scan_elements = buf_lo_scan_elements,
849 .lo_after_scan = buf_lo_after_scan,
853 const struct gfs2_log_operations gfs2_revoke_lops = {
854 .lo_before_commit = revoke_lo_before_commit,
855 .lo_after_commit = revoke_lo_after_commit,
856 .lo_before_scan = revoke_lo_before_scan,
857 .lo_scan_elements = revoke_lo_scan_elements,
858 .lo_after_scan = revoke_lo_after_scan,
862 const struct gfs2_log_operations gfs2_databuf_lops = {
863 .lo_before_commit = databuf_lo_before_commit,
864 .lo_after_commit = databuf_lo_after_commit,
865 .lo_scan_elements = databuf_lo_scan_elements,
866 .lo_after_scan = databuf_lo_after_scan,
867 .lo_name = "databuf",
870 const struct gfs2_log_operations *gfs2_log_ops[] = {